How to implement multi-column layout using CSS

Several ways to implement multi-column layout with css

If the following three p's are displayed on the same line

<p >
<p style="background-color:red">1</p>
<p style="background-color:yellow">2</p>
<p style="background-color:blue">3</p>
</p>

1: float implements multi-column layout

The float attribute controls whether and how the target HTML component floats. After setting this property, the object will be treated as a block component.

A floating HTML component will float and follow its predecessor until it encounters a border, inner patch, outer patch, or another block.

        p>p{
            border:1px solid black;
            float:left;
            width:200px;
            height: 200px;
            text-align: center;
        }

##2: inline-block box model

The elements of the inline-block box model will not occupy a single line, and also support specifying width and height using width and height. The inline-block box model will be bottom-aligned by default, and vertical-align:top can align its top.

        p>p{
            display:inline-block;
            border:1px solid black;
            text-align:center;
            width:200px;
            height: 200px;
            vertical-align: top;
        }

Inline-block There will be a gap between horizontally rendered elements when displayed in line breaks or separated by spaces. Remove the spaces and the gaps will disappear naturally.

##3: display: flex Flexible Layout

FlexibleThe layout function is relatively powerful and can provide the maximum flexibility for the box model to implement complex layouts. , any container can be designated as Flex layout.

flex-direction: column; Indicates vertical arrangement in the parent container.

        p{
            display: flex;
            flex-direction: row;
            height:200px;
            width: 600px;
        }
        p>p{
            border:1px solid black;
        }

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